Researchers from the University of California, Berkeley, Lawrence Berkeley National Laboratory, Carnegie Mellon University, and the German Institute of Combustion Technology have jointly demonstrated that an electrolyte can effectively increase the capacity of lithium-air batteries. This electrolyte consists of anions that release more electrons and non-aqueous solvents that emit less electrons. The study was published in the "Proceedings of the National Academy of Sciences". For electric vehicles, the metal air battery is undoubtedly the most attractive potential star. Its light weight, high energy density, and long battery life combine all the characteristics needed for an electric vehicle. However, lithium-air batteries have not been demonstrated so far because of its fatal flaw, that is, the solid reaction product will accumulate at the positive electrode, which will cause the discharge to stop. The product of the electrochemical reaction of non-water-soluble lithium air batteries is lithium peroxide. Lithium peroxide is insoluble in aprotic organic solvents and forms deposits on the surface of the cathode, eventually rendering the cathode unreactive and reducing the capacity of the cell. Several research institutes have been trying to overcome this problem. One of them is to adjust the electrolyte to enhance the solubility of intermediate products. The researchers conducted a qualitative and quantitative study of the electrolyte and measured how to increase the battery capacity by dissolving lithium oxide. In their designed electrolytes, the battery capacity can be increased by a factor of 4 and it proves that anions play a very important role in the battery cycle. The researchers then used a scanning electron microscope to examine the deposition of lithium peroxide on the surface of the cathode. The results show that the increase in battery capacity may be due to the increase in the presence of soluble oxygen ions induced by NO3- (nitrate ions with one unit of negative charge). NMR further confirmed that NO3- ions play an important role in the release of electrons from the electrolyte. The researchers also studied the thermodynamic properties of the solvent to obtain a quantitative model of how the amount of anionic electrons released affects battery capacity. They used a simplified Ising model to describe the lithium ion solvation layer, which is mainly used to study the interaction between adjacent particles. The researchers gave a function for the release of solvent electrons. Under the assumption that the position of the electrolyte in the lithium ion solvation layer is constant, it is shown that with the increase of the NO3-ion concentration, it can occupy more in the solvation layer. position. Using this model, the researchers created contour plots to provide a broad tool for studying metal-air batteries. The conclusion is that it can release more anions of anions, making it impossible to form lithium oxide, thereby increasing the battery capacity. This study shows that the electrolyte targeting intermediate products is a way to overcome the defects of lithium air batteries and increase the battery capacity. In addition, the model can also be widely applied to other metal air batteries. (Reporter He Wei) Sliding Bar Set,Wall Mounted Sliding Bar Set,Sliding Bar With Shower Bracket,Adjustable Sliding Rail Set,shower rod set Kaiping Rainparty Sanitary Ware Technology Co.,Ltd. , https://www.rpshower.com
Optimize electrolyte to increase lithium air battery capacity